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US7105216B2 - Conductive resin coated steel pipe and extrusion molding method for the steel pipe - Google Patents

Conductive resin coated steel pipe and extrusion molding method for the steel pipe Download PDF

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Publication number
US7105216B2
US7105216B2 US10/472,163 US47216303A US7105216B2 US 7105216 B2 US7105216 B2 US 7105216B2 US 47216303 A US47216303 A US 47216303A US 7105216 B2 US7105216 B2 US 7105216B2
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United States
Prior art keywords
resin
conductive
steel pipe
coating
coated steel
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US10/472,163
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US20040086672A1 (en
Inventor
Shuji Yoshino
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Yazaki Kako Corp
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Yazaki Kako Corp
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Assigned to YAZAKI INDUSTRIAL CHEMICAL CO., LTD. reassignment YAZAKI INDUSTRIAL CHEMICAL CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: YOSHINO, SHUJI
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/151—Coating hollow articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/19—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their edges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/22—Articles comprising two or more components, e.g. co-extruded layers the components being layers with means connecting the layers, e.g. tie layers or undercuts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • B29C48/34—Cross-head annular extrusion nozzles, i.e. for simultaneously receiving moulding material and the preform to be coated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2055/00—Use of specific polymers obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in a single one of main groups B29K2023/00 - B29K2049/00, e.g. having a vinyl group, as moulding material
    • B29K2055/02—ABS polymers, i.e. acrylonitrile-butadiene-styrene polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2023/00—Tubular articles
    • B29L2023/22—Tubes or pipes, i.e. rigid
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S138/00—Pipes and tubular conduits
    • Y10S138/07—Resins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1355—Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1355—Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
    • Y10T428/1359—Three or more layers [continuous layer]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
    • Y10T428/1393—Multilayer [continuous layer]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24174—Structurally defined web or sheet [e.g., overall dimension, etc.] including sheet or component perpendicular to plane of web or sheet
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24521—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
    • Y10T428/24521—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness with component conforming to contour of nonplanar surface
    • Y10T428/24537—Parallel ribs and/or grooves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal

Definitions

  • the present invention belongs to a technical field of a conductive-resin-coated steel pipe and a method of extrusion-forming it. More specifically, the present invention relates to a conductive-resin-coated steel pipe which is suited to be used as, for example, a frame component of a structure such as a flow-through rack, a driven conveyor or the like for holding or transporting parts of low electrical current devices or the like, and a method of extrusion-forming it.
  • a conductive-resin-coated steel pipe of about 28–32 mm in outer diameter is used as a frame component of a structure such as a flow-through rack, a driven conveyor or the like for holding or transporting parts of low electrical current devices or the like, in order to prevent static electrification.
  • a coating of about 1 mm in thickness of conductive synthetic resin containing carbon black is formed on the outer circumferential surface of a thin-walled steel pipe of about 26–30 mm in outer diameter.
  • a conductive-resin-coated steel pipe disclosed in Japanese Examined Utility Model Publication No. H8(1996)-5796, wherein on the outer circumferential surface of a thin-walled steel pipe, a coating of about 1 mm in thickness of synthetic resin such as AAS resin or the like of a chromatic color is formed, and on top of that coating a strip of conductive synthetic resin containing carbon black is formed integrally in the axial direction of the conductive-resin-coated steel pipe.
  • filler fiber having high impact resistance has been attracting attention.
  • the filler is expensive. Therefore, a steel pipe coated with resin containing the filler, particularly a steel pipe coated with conductive resin containing the filler has not been widely promoted.
  • the object of the present invention is to provide a conductive-resin-coated steel pipe in which filler is used in place of carbon black and which enables lower unit production cost and a better appearance, and a method of extrusion-forming such pipe.
  • the invention as recited in claim 1 relates to a conductive resin-coated steel pipe ( 1 ), is characterized in that a coating of reprocessed resin ( 3 ) such as polyethylene, ABS (acrylonitrile-butadiene-styrene copolymer), AAS (acrylonitrile-acrylic rubber-styrene copolymer), polypropylene or the like, is formed on an outer circumferential surface of a thin-walled steel pipe ( 2 ), and a coating of conductive resin ( 4 ), such as polyethylene, ABS.
  • reprocessed resin 3
  • ABS acrylonitrile-butadiene-styrene copolymer
  • AAS acrylonitrile-acrylic rubber-styrene copolymer
  • polypropylene or the like is formed on an outer circumferential surface of a thin-walled steel pipe ( 2 ), and a coating of conductive resin ( 4 ), such as polyethylene, ABS.
  • the invention is characterized in that said thin-walled steel pipe ( 2 ) is round in cross section, and said coating of conductive resin ( 4 ), which said conductive resin is combined with said filler, consists plural pairs of equal thinner-and-wider layer-portions ( 4 a ) and equal thicker-and-narrower layer-portions ( 4 b ) to exhibit electrical conductivity, which said portions alternate along the outer circumferential surface of said coating of reprocessed resin ( 3 ).
  • the conductive-resin-coated steel pipe ( 1 ) according to the invention is characterized in that said thickness and width required for a portion of the coating of said conductive resin ( 4 ), which said conductive resin is combined with said filler, to exhibit electrical conductivity is at least approximately 0.5 mm and at least 2 mm, respectively.
  • the invention is characterized in that said conductive resin ( 4 ), which said conductive resin is combined with said filler, is loaded with a colorant to give to said conductive-resin-coated steel pipe a chromatic color.
  • the invention further relates to a method of extrusion-forming a conductive-resin-coated steel pipe, characterized in that a coating of reprocessed resin ( 3 ) such as polyethylene, ABS, AAS, polypropylene or the like is formed on an outer circumferential surface of a thin-walled steel pipe ( 2 ) by extrusion-forming method and a coating of conductive resin ( 4 ), such as polyethylene, ABS, AAS, polypropylene or the like, which said conductive resin is combined with a filler, is extrusion-formed on an outer circumferential surface of said coating of reprocessed resin ( 3 ) by extrusion-forming method, wherein said coating of conductive resin is made to have plural thinner-and-wider layer-portions ( 4 a ) and plural thicker-and-narrower layer-portions ( 4 b ) to exhibit electrical conductivity, which said portions alternate along said circumferential surface of said coating of reprocessed resin and arranged in a circumfer
  • FIG. 1A is a cross-sectional view of a conductive-resin-coated steel pipe according to the present invention
  • FIG. 1B shows part X of FIG. 1A on an enlarged scale
  • FIG. 2 is an elevation of a main part of a cross die type extruding machine
  • FIG. 3 is a cross-sectional view taken along line III—III of FIG. 2 ;
  • FIGS. 4A and 4B are a front view and a cross-sectional view, respectively, of a head for inner-layer forming resin.
  • FIGS. 5A and 5B are a front view and a cross-sectional view, respectively, of a head for outer-layer forming resin.
  • FIGS. 1A and 1B shows an embodiment of a conductive-resin-coated steel pipe 1 .
  • the conductive-resin-coated steel pipe 1 is suited to be used as, for example, a frame component of a structure such as a flow-through rack, a driven conveyor or the like for holding or transporting parts of low electrical current devices or the like.
  • the conductive-resin-coated steel pipe 1 is based on a technical idea of using inexpensive reprocessed resin and reducing the use of conductive resin containing expensive filler, in either case to the extent possible while at the same time ensuring sufficient electrical conductivity.
  • a coating of reprocessed resin 3 such as polyethylene, ABS, AAS, polypropylene or the like, is formed on the outer circumferential surface of a thin-walled steel pipe 2 .
  • a coating of conductive resin 4 such as polyethylene, ABS, AAS, polypropylene or the like, combined with a filler, is formed in a manner that, in the case of FIG. 1 , 12 equal portions 4 b each having a thickness and width required for the portion 4 b to exhibit electrical conductivity, are arranged in 12 positions equally spaced apart in the circumferential direction of the pipe.
  • Each portion 4 b extends continuously in the axial direction of the pipe, in the form of a strip, and the coating of reprocessed resin 3 and the coating of conductive resin 4 form a thin two-layer coating that covers the entire outer circumferential surface of the thin-walled steel pipe 2 and has a uniform cross-section in the axial direction of the pipe.
  • Substantially the same embodiment can be made by using resin other than the above mentioned ones, such as polystyrene or methacrylate resin, as the reprocessed resin 3 .
  • resin other than the above mentioned ones such as polystyrene or methacrylate resin
  • the conductive resin 4 restricted to use of the above-mentioned examples.
  • 12 equal conductive portions 4 b are provided equally spaced apart along the circumferential direction of the pipe.
  • the reason that so many conductive portions 4 b are provided is that, in the case of a structure such as a flow-through rack, a driven conveyor or the like can be constructed freely without paying special attention to the positions of the conductive portions 4 b to which a ground wire need be connected. As long as at least one conductive portion 4 b extends continuously in the axial direction of the pipe, it it will be sufficient for a ground wire to be connected. However, in the case where only one conductive portion 4 b is provided, it would be necessary to construct the structure, taking the position of the conductive portion 4 b into consideration.
  • the coating of conductive resin 4 on the outer circumferential surface of the coating of reprocessed resin 3 consists of thinner-and-wider layer-portions 4 a and thicker-and-narrower layer-portions (conductive portions), 4 b . Accordingly, the coating of reprocessed resin 3 necessarily consists of thicker-and-wider layer-portions 3 a and thinner-and-narrower layer-portions 3 b .
  • the coating of reprocessed resin 3 necessarily consists of thicker-and-wider layer-portions 3 a and thinner-and-narrower layer-portions 3 b .
  • the thin-walled steel pipe 2 is round in cross section, and the coating of conductive resin 4 consist of 12 equal thinner-and-wider layer-portions 4 a and 12 equal thicker-and-narrower layer-portions, (conductive portions) 4 b which alternate along the circumferential surface of the coating of reprocessed resin 3 .
  • the number of the portions 4 a (portions 4 b ) is not restricted to 12.
  • the thin-walled steel pipe 2 is a little less than 1 mm in wall thickness and about 26–30 mm in outer diameter.
  • Each thinner-and-wider layer-portion 4 a of the coating of conductive resin 4 is approximately 0.2 mm in thickness, and each thicker-and-narrower layer-portion, (the conductive portions) 4 b is approximately 0.7 mm in thickness and approximately 2 mm in width.
  • Each thicker-and-wider layer-portion 3 a of the coating of reprocessed resin 3 is approximately 0.7 mm in thickness, and each thinner-and-narrower layer-portion 3 b thereof is approximately 0.2 mm in thickness. Therefore, the conductive-resin-coated steel pipe 1 is extrusion-formed and round in cross section, and approximately 27.8–32 mm in outer diameter.
  • the conductive resin 4 is loaded with a colorant to produce a chromatic color such as green, ivory or the like.
  • FIGS. 2 and 3 show a cross die type extruding machine used in the above-mentioned extrusion-forming method.
  • reference numeral 10 denotes a head portion of a cross die that is a main part of the extruding machine.
  • the basic structure is similar to that of an extruding machine according to the applicant's Japanese Patent No.2867244.
  • an adaptor 11 is fixed at the front end of a cross die (not shown), and a distribution piece 14 and a head 15 for inner-layer forming resin are fixed to the front end of the adaptor 11 by means of a distribution plate 12 . Further, in front of the afore mentioned pieces, a radial distribution piece 16 and a head 17 for outer-layer forming resin are fixed by means of a distribution plate 13 . The distribution plates 12 and 13 are joined together. A connecting piece 20 , which is connected to a heating cylinder, is fixed to the upper areas of the joint surface of the distribution plates 12 and 13 .
  • reprocessed resin 3 supplied from the cross die is formed into a coating on the outer circumferential surface of the thin-walled steel pipe 2 , and then by means of the head 17 for outer-layer forming resin, conductive resin 4 supplied from the heating cylinder is formed into a coating on the outer circumferential surface of the coating of reprocessed resin 3 .
  • the flow path for conductive rein 4 from the connecting piece 20 to the head 17 for outer-layer forming resin includes a first flow path 18 in the form of a large semicircular arch running around the thin-walled steel pipe 2 .
  • the opposite end portions of the first flow path 18 are bent and connected to inside second flow paths 19 , 19 , which are of a smaller diameter.
  • the second flow paths 19 , 19 are joined, wherein their joint portions are narrowed so that resin can be extruded uniformly toward the center.
  • the second flow paths 19 , 19 are connected to radial flow paths formed in the radial distribution piece 16 , and radial flow paths 17 a and a through-hole 17 b of the head 17 for outer-layer forming resin (see FIG. 5 ).
  • the head 15 for inner-layer forming resin has a through-hole 15 a for forming a coating of reprocessed resin 3 .
  • the circumferential surface defining the through-hole 15 a consists of 12 equal ridges and 12 equal channels 15 b which alternate in the circumferential direction and each extend in the axial direction of the pipe.
  • the ridges are provided for forming thinner portions, and have a width of 2 mm.
  • the channels 15 b are provided for forming thicker portions, and have a depth of about 0.7 mm.
  • the head 17 for outer-layer forming resin has radial paths 17 a and a through-hole 17 b for forming a coating of conductive resin 4 on the coating of reprocessed resin 3 .
  • the flow paths 17 a are arranged to correspond to the ridges for forming thinner portions of the head 15 for inner-layer forming resin, and have substantially the same width as that of the ridge.
  • the through-hole 17 b defines the outer diameter of the conductive-resin-coated steel pipe 1 .
  • the conductive-resin-coated steel pipe 1 is extrusion-formed with the above-described extruding machine as follows: First, on the outer circumferential surface of a thin-walled steel pipe 2 that is being moved from the cross die (not shown) to the right, a coating of reprocessed resin 3 is formed by means of the head 15 for inner-layer forming resin, wherein the reprocessed resin 3 is supplied to the head 15 through the adaptor 11 and the distribution piece 14 .
  • a coating of conductive resin 4 is formed on the outer circumferential surface of the coating of reprocessed resin 3 by means of the head 17 , wherein the conductive resin 4 is supplied to the through-hole 17 b from the connecting piece 20 through the first flow path 18 , the second flow paths 19 , the radial distribution piece 16 , a space between the head 15 for inner-layer forming resin and the head 17 for outer-layer forming resin, and the flow paths 17 a.
  • a two-layer coating consisting of the coating of reprocessed resin 3 and the coating of conductive resin 4 and having a uniform outer diameter and cross-section in the axial direction of the pipe is extrusion-formed, wherein the coating of reprocessed resin 3 consists of alternating 12 equal thicker portions and 12 equal thinner portions and also the coating of conductive resin 4 consists of alternating 12 equal thicker portions and 12 equal thinner portions.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
US10/472,163 2001-03-22 2002-03-11 Conductive resin coated steel pipe and extrusion molding method for the steel pipe Expired - Fee Related US7105216B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001083044A JP3627050B2 (ja) 2001-03-22 2001-03-22 導電性樹脂被覆鋼管およびその押し出し成形方法
JP2001-083044 2001-03-22
PCT/JP2002/002234 WO2002076728A1 (fr) 2001-03-22 2002-03-11 Tuyau en acier revetu de resine conductrice et procede de moulage par extrusion du tuyau en acier

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US20040086672A1 US20040086672A1 (en) 2004-05-06
US7105216B2 true US7105216B2 (en) 2006-09-12

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EP (1) EP1400346B1 (ja)
JP (1) JP3627050B2 (ja)
KR (1) KR100835668B1 (ja)
CN (1) CN1331662C (ja)
BR (1) BR0208279A (ja)
CA (1) CA2441008C (ja)
DE (1) DE60209696T2 (ja)
HK (1) HK1070328A1 (ja)
MX (1) MXPA03008442A (ja)
MY (1) MY129313A (ja)
TW (1) TW592949B (ja)
WO (1) WO2002076728A1 (ja)

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KR20040063254A (ko) * 2003-01-06 2004-07-14 김인배 복합 기능의 파이프
JP2005330092A (ja) * 2004-05-21 2005-12-02 Sekisui Jushi Co Ltd パイプ構造物
US20070246765A1 (en) * 2006-03-30 2007-10-25 Lars Bach Semiconductor memory device and method for production
CN102287587B (zh) * 2011-06-07 2013-04-10 南通高欣金属陶瓷复合材料有限公司 内衬氧化铝陶瓷的小口径管道及制备方法
CN202691565U (zh) * 2012-06-05 2013-01-23 张家港中集圣达因低温装备有限公司 一种玻璃钢管及低温压力容器
CN103101174B (zh) * 2013-02-01 2014-12-24 浙江曼瑞德舒适系统有限公司 塑料管材涂覆机头及含有塑料管材涂覆机头的塑料管材涂覆装置
DE102013222937A1 (de) * 2013-11-11 2015-05-13 Gebr. Schmid Gmbh Transportvorrichtung für flache Substrate
CN109386668A (zh) * 2017-08-09 2019-02-26 上海众山特殊钢有限公司 一种航空高压油薄壁不锈钢路管
KR102712652B1 (ko) * 2020-07-23 2024-10-04 주식회사 엘지화학 열가소성 수지 조성물 및 이의 성형품

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MXPA03008442A (es) 2004-01-29
CN1331662C (zh) 2007-08-15
HK1070328A1 (en) 2005-06-17
MY129313A (en) 2007-03-30
KR20030085003A (ko) 2003-11-01
TW592949B (en) 2004-06-21
DE60209696T2 (de) 2006-09-21
JP2002283428A (ja) 2002-10-03
DE60209696D1 (de) 2006-05-04
EP1400346A1 (en) 2004-03-24
JP3627050B2 (ja) 2005-03-09
BR0208279A (pt) 2004-03-23
KR100835668B1 (ko) 2008-06-09
WO2002076728A1 (fr) 2002-10-03
US20040086672A1 (en) 2004-05-06
CA2441008A1 (en) 2002-10-03
CA2441008C (en) 2009-06-30
EP1400346A4 (en) 2005-01-05
EP1400346B1 (en) 2006-03-08
CN1537051A (zh) 2004-10-13

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